Huang Longyu is extremely similar to the natural yellow jade (Astragalus membranaceus) only in terms of color, texture and hardness. At present, the more feasible non-destructive identification method is based on the differences in mineral density, granularity, polished surface texture, refractive index and the distribution characteristics of limonite observed by a high magnification magnifier.
First of all, the density of Huanglongyu is generally lower than that of jadeite, Huanglongyu is 2.60-2.65, and jadeite is 3.33, so the former is obviously lighter than the latter.
Secondly, the granules of Astragalus membranaceus are generally above 0.01 mm, which is larger than Huanglongyu. Therefore, the crystalline particles of the scutellaria and the cleavage surface of the granules (green, or sputum) are usually visible to the naked eye, but the high quality huanglong jade is not visible. The light characteristics of the jade polished surface are not green (or sturdy), and there is no micro-rough.
Again, the refractive index of the two is also different, Huanglongyu is 1.54, and Huangqi is 1.66.
Finally, under the high magnification magnifying glass, the yellow-brown colloidal limonite of Astragalus membranaceus can show obvious reticular characteristics, while Huanglongyu does not.
Hetian jade
It is difficult to distinguish with the naked eye. First, the chemical composition is different. The main components of Huanglongyu are silica muscovite, and the chemical composition of Hetian jade is hydrous calcium magnesium silicate. Second, the hardness is different. The hardness of Huanglongyu is 6.5-7, and Hetian jade is 6- 6.5.
agate
Both Huanglongyu and Agate can be called chalcedony, because the chemical composition of both is silica, and the structure is a cryptocrystalline aggregate of quartz. Therefore, the two are not only very similar in texture, but also have concentric circles. The industry mainly distinguishes them by the following methods: First, the specifications, Huanglongyu natural red material is a lot, but the agate is extremely rare; the second is the fluorescent sense, Huanglongyu has a strong fluorescent sense, agate is not; three is the texture, Huanglong jade wax The texture is strong, and the agate is not. The fourth is brittle, the agate is very brittle and easy to break, and Huanglongyu has strong toughness and is not easy to break.
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